Add Bootstrap CSS files to your project From the command line, in the root folder of your project, type: npm install --save bootstrap
Open root folder/.angular-cli.json in your favorite editor. Add the following under "apps", then under "styles""../node_modules/bootstrap/dist/css/bootstrap.min.css", DO NOT FORGET THAT COMMA ON THE END OR YOU'LL PULL YOUR HAIR OUT WONDERING WHY YOU NEVER FINISHED COLLEGE.